Capital Program Planning for Washington Electric Utilities

by | Oct 21, 2026

Washington · Electric & Grid Utilities

The Northwest grid could grow 50–100% in 20 years. Your capital plan is where that lands.

Data centers, electrification, and a legislated 100%-clean deadline are stacking new load and new obligations onto a grid built on federal hydropower. Each of those forces reshuffles the projects on your list. Invizion helps electric utilities re-sequence a capital portfolio in a click — and defend every decision.

See how Invizion helps utilities See what Washington utilities face Download the briefing (PDF)
The bottom line: Washington's hydro-built grid could grow 50–100% in 20 years while CETA forces coal out and 100% clean in by 2045. The utilities that keep the lights on will be the ones whose capital plans can re-sequence as fast as the load forecast and the funding change.
50–100%1
Projected growth of the Northwest power system over the next 20 years, with data centers a leading near-term driver.
9,000 MW1
New renewables the region must add 2027–2032 — alongside 5,000 MW of storage.
~$5B2
Bonneville Power Administration's transmission-expansion program across 20+ projects.
100% clean · 20453
CETA deadline — coal-free by 2025, greenhouse-gas-neutral by 2030.

The Washington Landscape

Four forces are moving your project list at once

None of these is theoretical, and none of them waits for your next budget cycle. Together they mean the capital plan you approved last year may already be the wrong plan.

Demand — Load Growth

Decades of flat load, then a step change

The Northwest Power and Conservation Council's draft Ninth Power Plan projects regional energy demand rising from about 22,000 average MW today to 31,000–44,000 aMW by 2046 — a system that grows 50–100% in 20 years, with data centers named the major near-term driver.1

Central Washington's low-cost hydropower — Chelan County residential rates near 3 cents per kWh — has made the region a magnet for data centers, and every large new customer is a capacity commitment competing for the same capital.13

Reliability — Hydro & Peaks

A hydro-built grid meeting a rising peak

Hydroelectricity is Washington's primary generation source, and the state's low 10.13 cents/kWh average retail price reflects it.4 But that backbone is federal: Bonneville markets power from 31 dams, supplies about 28% of the region's electricity, and controls roughly 75% of its high-voltage transmission.5

Utilities like Snohomish County PUD still draw about 77% of their power from Bonneville — so drought years and a climbing winter peak (35,500 MW regionally, headed toward 47,000–60,000 MW by 2046) land directly on resource-adequacy margins.61

Generation — The Transition

Coal out, clean in — on a legislated clock

The Clean Energy Transformation Act requires utilities to eliminate coal by 2025, be greenhouse-gas-neutral by 2030, and reach 100% clean electricity by 2045.3 That reshapes every IRP: Puget Sound Energy's 2023 mix was still 30% hydro, 30% gas, 22% wind, and 18% coal.8

The Northwest's only nuclear plant, the 1,207 MW Columbia Generating Station, is now a rare firm carbon-free anchor — and the region needs 9,000 MW of new renewables and 5,000 MW of storage by 2032 to fill the gap.71

Capital — Transmission & Grid

Build transmission and modernize at once

Bonneville is advancing roughly $5 billion of transmission expansion across more than 20 projects, and raised annual grid-reinforcement spending to $590 million in FY2025 from $377 million a year earlier.2

For the investor-owned utilities, recovery is the pressure point: PSE's pending rate plan seeks a 15.2% electric increase in 2027, and Avista is asking for $111 million (13.9%) starting January 2027.910 New obligations stack on the backlog — something on the list has to move.

Who Runs Washington's Grid

A few investor-owned utilities, a very large public-power sector, and a federal backbone

Washington is a public-power state. Three UTC-regulated investor-owned utilities sit alongside big municipal utilities and PUDs — all resting on Bonneville's federal hydro and transmission system. The pressures are shared; the accountability path differs.

Investor-owned utilities

Rates & capital recovery regulated by the WA UTC

Puget Sound Energy (PSE) ~1.24M electric customers · 8 counties8
Avista 422,000 electric customers · HQ Spokane11
Pacific Power SE / central WA · a division of PacifiCorp (Berkshire Hathaway Energy)

PSE's pending multiyear rate plan seeks a 15.2% electric increase in 2027 — approvals are not a formality.9

Public power & the federal backbone

Governed by boards, councils & federal statute, not UTC rates

Seattle City Light 493,663 customers · carbon-neutral since 200512
Snohomish County PUD 373,000 customers · ~77% of power from BPA6
Tacoma Power Municipal · division of Tacoma Public Utilities, hydro-based
Chelan & Grant County PUDs Columbia River dams · Chelan >2,000 MW hydro1314
Bonneville Power Administration Federal · 31 dams, ~28% of NW power5

Bonneville's ~$5 billion transmission-expansion program underpins nearly every utility in the state.2

Rate-Setting & Oversight

Every capital dollar has to be defensible

Whether you answer to the UTC, an elected PUD board, or a federal rate process, the question is the same: why this project, why now, why at this cost?

  • Washington UTC regulates rates, capital recovery, and clean-energy plans for the investor-owned utilities — PSE, Avista, and Pacific Power.15
  • PSE's pending rate plan (filed February 2026) requests electric increases of 15.2% in 2027, 3.7% in 2028, and 8.7% in 2029, with a UTC decision expected in early 2027.9
  • Avista's 2026 case seeks $111 million (13.9%) in electric revenue effective January 2027 at a requested 10.2–10.5% ROE, phased through 2030.10
  • Cap-and-invest — Washington's carbon market launched in February 2023, and voters rejected repeal Initiative 2117 in 2024 (about 62% opposed), locking the program in as a lasting cost-and-funding factor for utilities.1617
  • Public power sets its own rates — Seattle City Light, Tacoma Power, and the PUDs answer to councils and elected boards, making capital decisions in front of their customer-owners.12

Funding On The Table

The money is moving — can your plan absorb it?

Washington utilities have more grid and clean-energy capital in play than they've had in a generation. The constraint is readiness: which projects qualify, which are shovel-ready, and how the timing lines up.

  • Bonneville transmission: ~$5B across 20+ expansion projects, plus $590M of grid reinforcement in FY2025 (up from $377M in FY2024).2
  • DOE GRIP: $6B+ nationally across Rounds 1 and 2 of the Grid Resilience and Innovation Partnerships program — the federal pool Washington utilities compete into for resilience and transmission.18
  • ~$2.3B annual regional need by 2032 — the estimated fixed cost of the draft Ninth Plan portfolio (9,000 MW renewables, 5,000 MW storage, 2,100 MW gas).1
  • Cap-and-invest proceeds from Washington's allowance auctions are reinvested in clean transportation, resilience, and clean-energy projects utilities can align capital against.16
  • IRA elective (direct) pay lets public power and PUDs — Seattle City Light, Tacoma Power, Chelan and Grant — monetize clean-energy tax credits they historically could not use.

Where Invizion Fits

Turn Washington's grid build-out into a defensible capital plan

Invizion is scenario-based capital portfolio optimization built for utilities. When load forecasts jump, a grant lands, or a retirement date moves, you don't re-plan by hand for weeks — you model it and decide with a record to stand behind.

1

Model the “what-if” before it's forced on you

A data-center interconnect, a delayed transmission line, a moved retirement date — build the scenario and see the impact on the whole portfolio, side by side with today's plan.

2

Re-sequence 500 projects in a click

When priorities move, Invizion re-orders the portfolio automatically — accelerating, stretching, or deferring projects against the constraints you set, not weeks of spreadsheet surgery.

3

Give regulators or your board a defensible record

Every prioritization and trade-off is captured. When you're asked “why this project, why now,” the answer is documented — not reconstructed after the fact.

Washington's Grid, In Brief

Questions Washington utility leaders are asking

Short, sourced answers — the same facts we dig into with utilities looking at their capital programs.

How fast is Washington's (and the Northwest's) electricity demand growing?
The draft Ninth Power Plan projects the regional power system growing 50–100% over 20 years — from about 22,000 average MW today to 31,000–44,000 aMW by 2046 — with data centers the leading near-term driver.1
What does the Clean Energy Transformation Act require?
CETA requires Washington utilities to eliminate coal-fired electricity by 2025, be greenhouse-gas-neutral by 2030, and deliver 100% clean, carbon-free electricity by 2045.3
How dependent is Washington on hydropower?
Hydroelectricity is the state's primary generation source and keeps its average retail price low at 10.13 cents/kWh; Bonneville alone markets power from 31 federal dams and supplies about 28% of the region's electricity, so drought and a rising peak directly stress resource adequacy.45
Who regulates my utility's rates?
The Washington UTC regulates rates and clean-energy plans for the investor-owned utilities — PSE, Avista, and Pacific Power. Seattle City Light, Tacoma Power, and the PUDs are public power and set their own rates through councils and elected boards.1512
What grid funding is available in Washington?
Bonneville is advancing roughly $5 billion of transmission expansion, DOE's GRIP program has put more than $6 billion nationally in play, and the state's cap-and-invest auction proceeds are reinvested in clean-energy and resilience projects.21816
How does Invizion help Washington electric utilities plan capital?
Invizion is scenario-based capital portfolio optimization for utilities. It lets you model how a data-center load surge, a drought year, a grant award, or a CETA milestone reshuffles your whole project list, re-sequence the portfolio automatically, and keep a defensible record of every decision for the UTC or your board.

Go Deeper

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About the Author

GB

Guy Barlow

President, Invizion

Guy Barlow leads Invizion, a capital lifecycle management platform for water and wastewater utilities. He has spent two decades at the intersection of utility capital programs, funding, and analytics, helping utilities make faster, more defensible capital decisions.

Explore Further

See how utilities keep capital plans defensible

Invizion helps utilities model, optimize, and defend their capital programs. Explore how it works, or read our latest thinking on capital planning across the utility sector.

Explore Invizion

This briefing was last reviewed September 2026.

Sources

  1. Northwest Power and Conservation Council — Draft Ninth Power Plan: regional demand 22,000 → 31,000–44,000 aMW by 2046, 50–100% system growth, 9,000 MW renewables + 5,000 MW storage 2027–2032, ~$2.3B fixed cost by 2032, 2026. www.nwcouncil.org
  2. Bonneville Power Administration — transmission expansion ~$5B across 20+ projects; $590M FY2025 grid reinforcement (up from $377M FY2024), 2024. www.bpa.gov
  3. Washington State Department of Commerce — Clean Energy Transformation Act: coal-free by 2025, GHG-neutral by 2030, 100% clean electricity by 2045. www.commerce.wa.gov
  4. U.S. Energy Information Administration — Washington electricity profile: hydroelectric primary source, average retail price 10.13 cents/kWh, 102.4M MWh net generation, 2024. www.eia.gov
  5. Bonneville Power Administration (via Wikipedia) — markets power from 31 federal dams, ~28% of the region's electricity, ~75% of high-voltage transmission, 15,000+ circuit miles. en.wikipedia.org
  6. Snohomish County PUD (via Wikipedia) — ~373,000 customers; 76.8% of power purchased from BPA, 2023. en.wikipedia.org
  7. Columbia Generating Station / Energy Northwest (via Wikipedia) — 1,207 MW net; the Northwest's only commercial nuclear plant; 9.97M MWh in 2024. en.wikipedia.org
  8. Puget Sound Energy (via Wikipedia) — ~1.24M electric customers across 8 counties; 2023 mix 30% hydro, 30% gas, 22% wind, 18% coal. en.wikipedia.org
  9. Puget Sound Energy — 2026 general rate case: electric increases 15.2% (2027), 3.7% (2028), 8.7% (2029); UTC decision expected early 2027. www.pse.com
  10. Washington UTC — Avista rate case (dockets UE-260007/UG-260008): electric $111M (13.9%) effective Jan. 1, 2027, requested 10.2–10.5% ROE, phased through 2030. www.utc.wa.gov
  11. Avista Corporation (via Wikipedia) — 422,000 electric and 383,000 natural gas customers; headquartered in Spokane; serves WA, ID, OR. en.wikipedia.org
  12. Seattle City Light (via Wikipedia) — 493,663 customers, ~961,000 residents; carbon-neutral since 2005 (first U.S. electric utility to do so). en.wikipedia.org
  13. Chelan County PUD (via Wikipedia) — three hydro projects >2,000 MW; ~3 cents/kWh residential rate; ~9M MWh/year. en.wikipedia.org
  14. Grant County PUD (via Wikipedia) — operates Priest Rapids and Wanapum dams on the Columbia; customer-owned, elected board. en.wikipedia.org
  15. Washington Utilities and Transportation Commission — regulates rates, capital recovery, and clean-energy plans for investor-owned electric utilities. www.utc.wa.gov
  16. Washington State Department of Ecology — Climate Commitment Act cap-and-invest program launched Feb. 28, 2023; auction proceeds reinvested in climate and clean-energy projects. ecology.wa.gov
  17. Climate Commitment Act / Initiative 2117 (via Wikipedia) — 2024 repeal measure failed, ~62% of votes opposed, keeping cap-and-invest in place. en.wikipedia.org
  18. U.S. Department of Energy, Grid Deployment Office — GRIP program has announced $6B+ across Rounds 1 and 2 (of $10.5B total). www.energy.gov